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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]    
Revenues $ 11,246 $ 131,506
Portfolio operations:    
Inventor royalties 4,944 35,168
Contingent legal fees 591 31,501
Patent acquisition expenses 0 4,000
Litigation and licensing expenses - patents 7,803 8,866
Amortization of patents 3,194 27,120
Other portfolio expenses 1,756 2,602
Total portfolio expenses 18,288 109,257
Net portfolio income (loss) (7,042) 22,249
General and administrative expenses 16,376 18,728
Impairment of patent-related intangible assets 0 28,210
Operating loss (23,418) (24,689)
Other income (expense):    
Change in fair value of investment, net (Note 6) 9,899 (59,103)
Loss on sale of investment (Note 6) (9,230) (19,095)
Impairment of other investment (Note 6) (8,195) (1,000)
Gain on disposal of other investment (Note 6) 2,000 0
Change in fair value of the Series A warrants and embedded derivative 4,518 0
Interest income and other 5,473 218
Total other income (expense) 4,465 (78,980)
Loss before income taxes (18,953) (103,669)
Income tax (expense) benefit 1,824 (1,179)
Net loss including noncontrolling interests in subsidiaries (17,129) (104,848)
Net (income) loss attributable to noncontrolling interests in subsidiaries 14 (181)
Net loss attributable to Acacia Research Corporation (17,115) (105,029)
Less: Accretion of redeemable preferred stock (307) 0
Net loss attributable to common stockholders - basic $ (17,422) $ (105,029)
Basic net loss per share of common stock $ (0.35) $ (2.10)
Weighted average number of shares outstanding - basic 49,764,002 49,969,062
Add: Accretion of redeemable preferred stock $ 307 $ 0
Less: Mark-to-market adjustment for preferred stock embedded derivative (3,258) 0
Net loss attributable to common stockholders - diluted $ (20,373) $ (105,029)
Diluted net loss per share of common stock $ (0.40) $ (2.10)
Weighted average number of shares outstanding - diluted 50,896,773 49,969,062